This is interesting. You say that "the person behind you is yourself", but I (not the guy you're responding to btw) have experienced the same thing as >>5 but it was a person that was standing over me at the right of my bed.
I've also experienced sensations of people being behind me, and from what >>5 describes it seems like I used to experience the same thing as him, even when I felt someone at my bed (in front of me, and some distance away).
Do you have any sources I could look into about this? More info, etc?